The simplest way to add a heading in your document is to apply a heading style:
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Click Edit Document > Edit in Word for the web if you haven’t already opened your document for editing.
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Type your heading and keep your cursor on that line.
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Click Home, and then click the heading style you want in the Styles gallery.
Tip: If you don't see the style you want, click the down arrow next to the Styles gallery to expand the gallery.
